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        <title>Internal Help File</title>
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        <div id='buttons' class="section">
            <h4>Buttons</h4>
            <ul>

                <li><span class="button">Previous Time:</span> Changes from the current time to the previous time.
                  This can be an expensive operation since it requires new rendering.</li>
                <li><span class="button">Next Time:</span>
                  Moves to the next time step</li>
                <li><span class="button">Lower Slice:</span>
                  Lowers slice in 2D view and 3D sections view.</li>
                <li><span class="button">Raise Slice:</span>
                  Raises slice</li>
                <li><span class="button">Add Snake:</span>
                  Create a new snake.</li>
                <li><span class="button">Delete Snake:</span>
                  Delete the selected snake</li>
                <li><span class="button">Deform Snake:</span>
                  Deforms the current snake until the number of iterations has been
                  reached or the snake becomes too short.</li>
                <li><span class="button">Clear Current:</span>
                  Removes the current snake from this screen only.</li>
                <li><span class="button">Track Snake:</span>
                  Copies the current snake to the next time frame and deforms the snake.</li>
                <li><span class="button">Track Backwards:</span>
                  Copies the current snake to the previous time frame and deforms the snake.</li>
                <li><span class="button">Clear Screen:</span>
                  Removes all of the snakes in the current time frame.</li>
                <li><span class="button">Delete End Fix:</span>
                  Trims the ends of a snake.  Click where you want to trim, then click
                  near the end of the snake to be removed.</li>
                <li><span class="button">Delete Middle Fix:</span>
                  Click twice on the snake to remove a segment between two selected points (2 left clicks). A third left click places a new point. A third right click removes segment without placing a new point.</li>
                <li><span class="button">Stretch Fix:</span>
                  Extends the closest end of the snake to the next click location.</li>
                <li><span class="button">Zoom In:</span>
                  Zoom in the original 2D image by left clicking then right clicking, on the 2D image.</li>
                <li><span class="button">Zoom Out:</span>
                  Zoom out to the original 2D image.</li>
                <li><span class="button">+MAX:</span>
                  Increases maximum brightness of 3D display.</li>
                <li><span class="button">-MAX:</span>
                  Decreases maximum brightness of 3D display.</li>
                <li><span class="button">+MIN:</span>
                  Increases minimum brightness of 3D display.</li>
                <li><span class="button">-MIN:</span>
                  Decreases minimum brightness of 3D display.</li>


            </ul>
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        <div id='parameters' class='section'>

            <h4>Parameters</h4>
            <ul>
                <li><span class="parameter">Alpha:</span> Alpha determines the elasticity of the filament</li>
                <li><span class="parameter">Beta:</span> Beta cause a filament to straighten, can cause filament to grow.</li>
                <li><span class="parameter">Gamma:</span> Gamma restricts the distance the points move</li>
                <li><span class="parameter">Weight:</span> Weight changes the level of influence the image has</li>
                <li><span class="parameter">Stretch Force:</span> A factor to adjust the pulling force.</li>
                <li><span class="parameter">Deform Iterations:</span> Number of iterations per deform snake click.(esc will stop)</li>
                <li><span class="parameter">Snake Point Separation:</span>The distance between points when the contours are sampled</li>
                <li><span class="parameter">Image Smoothing:</span>The width of the gaussian filter that is applied to the image.</li>
                <li><span class="parameter">Z Spacing:</span>Distance between Z planes in x-y pixels.  Changing this value
                    will cause the 3D image to reload.</li>
                <li><span class="parameter">Foreground:</span>Determines the pixel value where the snake will stretch while deforming.</li>
                <li><span class="parameter">Background:</span>Complements the forground intensity. The snake will shrink when
                    the snake is less than the mean of the Foreground and Background intensities.</li>
            </ul>
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        <div id='menu' class='section'>
            <h4>Menus</h4>
            <ul>

                <li><span class="parameter">Image:</span> Load a different image.</li>
                <li><span class="parameter">Snakes:</span> Load and save snakes.  </li>
                <li><span class="parameter">Data:</span> Save elongation data.  </li>
                <li><span class="parameter">View:</span> Change the display configuration, or launch the external VTK viewer.</li>
                <li><span class="parameter">help:</span> Version and help information.</li>
            </ul>

        </div>

        <div id='keyboard' class='section'>
            <h4>Keyboard Shortcuts</h4>
            <ul>

                <li><span class="parameter">Arrow Keys</span> move the planes in the 3D section view.</li>
                <li><span class="parameter">",", and "." </span> Change the current slice.  Moves the X-Y plane up and down in 3D section view.</li>
                <li><span class="parameter">"Esc" </span> Cancels deform snake operation.  </li>
                <li><span class="parameter">"v"</span> Cycles to next view configuration.</li>
                <li><span class="parameter">"f"</span> Next time frame.</li>
                <li><span class="parameter">"b"</span> Previous time frame.</li>


            </ul>

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